Escherichia coli bacteria reduce graphene oxide to bactericidal graphene in a self-limiting manner
Escherichia coli bacteria reduce graphene oxide to bactericidal graphene in a self-limiting manner
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DOI：
10.1016/j.carbon.2011.12.035
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发表时间：
2012-04-01
期刊：
影响因子：
10.9
通讯作者：
Ghaderi, E.
中科院分区：
文献类型：
--
作者：
Akhavan, O.;Ghaderi, E.
化学剥离的氧化石墨烯（GO）纳米片和大肠杆菌细菌生活在混合酸发酵与厌氧条件下的相互作用进行了研究，为不同的曝光时间。X射线光电子能谱显示，随着暴露时间的增加（从0到48小时），GO的含氧官能团减少了类似于60%，表明通过与细菌的相互作用，片材的相对化学还原。拉曼光谱和电流-电压测量证实了暴露于细菌的GO的还原。这种减少被认为是由于存活细菌通过其糖酵解过程的代谢活性。结果发现，GO片可以作为生物相容性位点，用于在其表面上吸附和增殖细菌，而细菌减少的GO（BRGO）片显示出对在其表面上的细菌增殖的抑制。结果表明，BRGO片材的轻微抗菌性和已经增殖的细菌从这些片材表面的分离有助于细菌在还原片材表面上的生长抑制。(C)2011爱思唯尔有限公司保留所有权利。
Interactions of chemically exfoliated graphene oxide (GO) nanosheets and Escherichia coli bacteria living in mixed-acid fermentation with an anaerobic condition were investigated for different exposure times. X-ray photoelectron spectroscopy showed that as the exposure time increased (from 0 to 48 h), the oxygen-containing functional groups of the GO decreased by similar to 60%, indicating a relative chemical reduction of the sheets by interaction with the bacteria. Raman spectroscopy and current-voltage measurement confirmed the reduction of the GO exposed to the bacteria. The reduction was believed to be due to the metabolic activity of the surviving bacteria through their glycolysis process. It was found that the GO sheets could act as biocompatible sites for adsorption and proliferation of the bacteria on their surfaces, while the bacterially-reduced GO (BRGO) sheets showed an inhibition for proliferation of the bacteria on their surfaces. It was shown that the slight antibacterial property of the BRGO sheets and the detaching of the already proliferated bacteria from the surface of these sheets contributed to the growth inhibition of the bacteria on the surface of the reduced sheets. (C) 2011 Elsevier Ltd. All rights reserved.